Korloy SPMT040204-PD PC3500 Square Milling & U-Drill Insert (10pcs)
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The Original Korloy SPMT040204-PD PC3500 is a high-precision Square Indexable Insert widely used for U-Drills (Indexable Drills) and small-diameter milling cutters. The PC3500 Grade is a specialized CVD-coated carbide designed for high-efficiency machining of Carbon Steel and Alloy Steel. Featuring a robust 0.4mm corner radius and a specialized "PD" chipbreaker, this insert ensures excellent chip evacuation and edge stability during high-speed hole making and facing operations.
High-Speed Steel Specialist: PC3500 is engineered for productivity. Its thick CVD coating acts as a thermal barrier, allowing you to push higher cutting speeds (Vc) without compromising the integrity of the cutting edge.
Technical Specifications:
| Brand | Korloy (100% Genuine) |
| ISO Code | SPMT040204-PD |
| Corner Radius (r) | 0.4 mm |
| Grade | PC3500 (High-Speed CVD for Steel) |
| Primary Application | U-Drill Outboard Edge / Small Milling |
Core Performance Benefits:
- Optimized for Steel: Specifically formulated for P-group materials (1045, 4140, etc.), providing superior resistance to crater wear.
- CVD Multi-Layer Coating: The TiCN+Al2O3+TiN layers ensure the insert can withstand the intense heat of continuous drilling.
- PD Chipbreaker: Designed for smooth chip curling in confined spaces like drill flutes, reducing the risk of chip jamming.
- Cost-Efficient: Four usable cutting edges per insert provide excellent value for high-volume production.
Recommended Cutting Parameters:
| Workpiece Material | Cutting Speed (Vc) | Feed per Tooth (fz/fn) |
|---|---|---|
| Carbon Steel (HB180-280) | 150 - 280 m/min | 0.05 - 0.12 mm/rev |
| Alloy Steel (HB280-350) | 120 - 220 m/min | 0.04 - 0.10 mm/rev |
| Pre-hardened Steel | 80 - 150 m/min | 0.03 - 0.08 mm/rev |
Compatible Tooling Systems:
This insert is designed to fit standard SPMT-pocketed tools:
- Indexable U-Drills: King Drill (12mm-14mm range)
- Small Face Mills: SPMT Type Milling Cutters
Machinist Tip: PC3500 vs. PC5300
Choosing the right grade for your SPMT040204 inserts:
Best for Speed. A CVD grade that thrives in high-heat, high-speed steel machining. Ideal for long production runs where cycle time is the priority.
Best for Versatility. Use this for stainless steel or when cutting speeds are lower and toughness is more important than pure wear resistance.
Pro Advice: When used in a U-drill, PC3500 is typically used on the outer pocket. The outer insert covers more surface area and moves at a higher peripheral speed, where the CVD coating's heat resistance is most effective.
Packaging: 10 pieces per box.
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